[FFmpeg-cvslog] doc/filters: state negate filter's option

[Gyan Doshi]

ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Thu Jul  5 19:54:32 2018 +0530| [4cd5c3f9ec7859503d733ba7b5ab23994c1b2fc5] | committer: Gyan Doshi

doc/filters: state negate filter's option

Also clarify that the negate_alpha option is a boolean

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4cd5c3f9ec7859503d733ba7b5ab23994c1b2fc5
---

 doc/filters.texi | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index fb5f3eef4b..3e668703ae 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11437,10 +11437,15 @@ Default value for @option{hi} is 64*12, default value for @option{lo} is
 
 @section negate
 
-Negate input video.
+Negate (invert) the input video.
 
-It accepts an integer in input; if non-zero it negates the
-alpha component (if available). The default value in input is 0.
+It accepts the following option:
+
+ at table @option
+
+ at item negate_alpha
+With value 1, it negates the alpha component, if present. Default value is 0.
+ at end table
 
 @section nlmeans